There have been a number of questions about ebooks but I thought I'd pull the basics together into a Community Wiki.

Quick note on cross platform ebooks. It's possible to read the DRM'd Epub files on several devices, for example the Google books can be viewed by the Nook app. You have to do a couple things like sign up for Adobe Digital Editions... (this needs more explanation).

Lets try and keep the same formatting. If you come up with a better format then change this template too...

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8 Answers
8

Only does non-DRM'd ePubs. There are thousands of these books available but you're not going to be getting newly released copyrighted books. Great user interface but the no DRM limitation is a problem. Aldiko also has a paid app that has more features but it still doesn't let you load new DRM'd books from the major retailers.

About - I like this app. It's easy to switch your reading settings (brightness, font size...) on the fly. You can note and lookup text. It automatically syncs with all your devices so you can put one down and pick up reading on another right where you left off. As of v2 you can subscribe to magazines and newspapers via the Kindle store which will be regularly delivered to your Android device. Wikipedia and Dictionary.com word lookup whilst reading.

I know you can read PDFs, DOCs etc on a real Kindle, don't think the Kindle app will open them, and pretty sure Amazon's free conversion service will only deliver to physical Kindle devices? Will check later (as I have a Kindle 3 and the app on my Android). Probably worth mentioning the Kindle store has both DRM'd pay books and free classics available (Amazon say around 500,000 books currently).
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GAThrawnDec 7 '10 at 15:12

About - Simple 1st gen app. It automatically syncs with all your devices so you can put one down and pick up reading on another right where you left off. It is easy to change the fonts and font sizes and switch between night and day mode as your read. There is a very cool feature that I have not seen in the other apps where, when you are reading one of the books that Google physically scanned, you can switch from the normal view to viewing the actual scanned in page. My only complaint is the lack of ability to make notes and lookup words. Currently US only.

About - aReader is a good alternative to other readers, it supports the major formats and is easy to use. You can left a book half-read and when you return the app remembers where you were. It allows you to configure the font size, page orientation, and the other usual stuff for readers.